Determine if the Source fits your Purpose
"Day 231: Exciting Library Books!" by Anomalily. Licensed under a Creative Commons Attribution-NonCommerical license. http://www.flickr.com/photos/lilymonster/3753280427/
Who? author/creator/publisher; contact information and accountability
Why? documentation about the source; purpose of source
When? currency
What? accuracy, bibliographical apparatus (sources, glossary, further readings)
Where? geographic coverage; place of publication
EVALUATE INFORMATION from Meriam Library, California State University (Under RESEARCH, click on EVALUATE INFORMATION to open a .pdf guide).
CRITICAL EVALUATION OF INFORMATION RESOURCES from E. J. Pratt Library, U of T